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In Reply to: RE: Class D ultrasonic switching noise.... posted by Todd Krieger on October 09, 2015 at 17:33:57
If there is RF noise that does not correspond to the audio signal that was originally recorded, it is because the DAC is poorly designed. It should generate no RF noise of its own. To the extent that this is physically unavoidable by the digital process, then there should be analog filtering between the converter circuits and the analog outputs of the DAC.
However, you are correct. Most DACs do put out a lot of RF crap. Miksa on Computer Audiophile has some RF spectrum plots that demonstrate this. This is the result of poor (or ignorant) engineering.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Follow Ups:
"If there is RF noise that does not correspond to the audio signal that was originally recorded, it is because the DAC is poorly designed. It should generate no RF noise of its own."
If that's the case, then just about every DAC ever made is "poorly designed"...... I've yet to encounter a DAC that emitted RFI at low enough levels to where I couldn't notice any interference whatsoever from a radio placed next to it.
Heck, if a piece of gear like that did exist, I'd own it. Provided it isn't hideously expensive.
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